CVE-2026-33515

Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem cannot be mitigated by denying ICP queries using `icp_access` rules. Version 7.5 contains a patch.

• CWE-125
• CWE-1289

• https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165Patch
• https://github.com/squid-cache/squid/pull/2220Issue Tracking
• https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637Issue Tracking
• https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7cVendor Advisory
• http://www.openwall.com/lists/oss-security/2026/03/25/4Mailing List, Third Party Advisory

Published

Mar 26, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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